package co.yixiang.modules.pay.zhifubao;

import java.security.MessageDigest;

public class MD5Util {

	/**
	 * 功能描述:字符串转换为MD5
	 *
	 * @author houkun  2013-7-18 上午08:52:29
	 * 
	 * @param str字符串
	 * @return
	 */
	public static String encoderByMd5(String str){
		if(str==null || "".equals(str))
			return "";
		byte[] unencodedPassword = str.getBytes();
		MessageDigest md = null;
		try {
			md = MessageDigest.getInstance("MD5");
		} catch (Exception e) {
			return str;
		}
		md.reset();
		md.update(unencodedPassword);
		byte[] encodedPassword = md.digest();
		StringBuffer buf = new StringBuffer();
		for (int i = 0; i < encodedPassword.length; i++) {
			if ((encodedPassword[i] & 0xff) < 0x10) {
				buf.append("0");
			}
			buf.append(Long.toString(encodedPassword[i] & 0xff, 16));
		}
		return buf.toString();
	}
	

	
	
	public static String MD5Encode(String origin, String charsetname) {
        String resultString = null;
        try {  
            resultString = new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            if (charsetname == null || "".equals(charsetname))  
                resultString = byteArrayToHexString(md.digest(resultString  
                        .getBytes()));  
            else  
                resultString = byteArrayToHexString(md.digest(resultString  
                        .getBytes(charsetname)));  
        } catch (Exception exception) {
        }  
        return resultString;  
    }

	public static String MD5Encode_1(String origin) {
		String resultString = null;
		try {
			resultString = new String(origin);
			MessageDigest md = MessageDigest.getInstance("MD5");
			resultString = byteArrayToHexString(md.digest(resultString
					.getBytes()));
		} catch (Exception ex) {
		}
		return resultString;
	}
	
	private static String byteArrayToHexString(byte b[]) {
		StringBuffer resultSb = new StringBuffer();
		for (int i = 0; i < b.length; i++)
			resultSb.append(byteToHexString(b[i]));

		return resultSb.toString();
	}

	private static String byteToHexString(byte b) {
		int n = b;
		if (n < 0)
			n += 256;
		int d1 = n / 16;
		int d2 = n % 16;
		return hexDigits[d1] + hexDigits[d2];
	}

	private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
		"6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

}
